Binary package “linkchecker” in ubuntu bionic

check websites and HTML documents for broken links

 Provides a command line program and web interface to check links
 of websites and HTML documents.
  o recursive checking
  o multithreaded
  o output in colored or normal text, HTML, SQL, CSV, XML or a sitemap
    graph in different formats
  o HTTP/1.1, HTTPS, FTP, mailto:, news:, nntp:, Telnet and local file
    links support
  o restrict link checking with regular expression filters for URLs
  o proxy support
  o username/password authorization for HTTP, FTP and Telnet
  o robots.txt exclusion protocol support
  o Cookie support
  o i18n support
  o HTML and CSS syntax check
  o Antivirus check
 Users preferring a graphical interface can install the linkchecker-gui